Not the same. Beijing should be the coldest, shanghai and Hangzhou are more or less the same. It will be around 15-20 degrees in Shanghai, I guess. I am in Xian, it is sunny now and the temperature is 18degrees today, 22 degrees tomorrow. Beijing is about -3 to 9 degrees. So, you can figure out their difference roughly. For I can not see the weather report on April 2, I would like to tell when the date is very close.